“Since THC is continually in the body, the ‘high’ from pot gradually diminishes, and so pot smokers usually take other drugs to get a kick.
Nevertheless, they continue to smoke pot as they use the other drugs, because they think pot makes them ‘feel good all the time.’ Most pot smokers drink alcohol heavily, and many become so confused that they take cocaine and heroin…
Not all pot smokers use cocaine or heroin, but almost no one takes these drugs who has not used marijuana extensively.
Without pot smoking, there would be no demand for cocaine or heroin.”Mar. 2006